It's called an X-Y scatter plot. The procedure is different depending on which version you have. Basically, you highlight all of the cells containing, the data; click on 'Insert' then click the icon that looks like a 'dot plot' and it should have the word 'scatter' underneath it.
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All you have to do is create a directory on your server called pictures and then put all you pictures inside and link to them like so /pictures/hello.htm
Two common words meaning 'dot': 点 (てん) = 'point'; 'dot', as in 'draw a dot on a paper' ドット (どっと) = 'dot', as in 'www dot google dot com'
You might be able to use C to extract data from an Excel file, but there is no easy way to write a program to create an Excel file.
Go to the Help menu and look at the About option which will tell you. The version of Excel you have is linked to the version of Office you have. If you know what version of Office you have, then you know what version of Excel you have.
It's possible that Excel was written in C.